Hinge with circular cam eyelets, for the elastic articulated joining of the temples to the front of an eyeglass frame

A hinge with circular cam eyelets, for the elastic articulated joining of the temples to the front of an eyeglass frame, for the provision of which no welding is required of eyelets or of other joining parts to the respective end pieces of the front and of the temple, and the insertion is not required of articulation screws or pins, wherein it involves providing a hinge that is constituted by a pair of two independent outer eyelets, to be engaged with two tines provided at the hingeing end of the temple, and by a middle eyelet, to be engaged with two tines provided at the two side hingeing end pieces of the front of the eyeglass frame, said middle eyelet being provided with two coaxial cavities, with contoured bottom surfaces that define circular or radial cams, these surfaces being able to rotate and slide on corresponding and mutually opposite radial cam surfaces of the outer eyelets which, with the rotation of the temples with which they are associated, cause an axial translational movement of said outer eyelets, this translational movement being opposed elastically by the tines of the hingeing ends of the temples, thus determining the opening and closing click of said temples on the front of the eyeglass frame.